My wife upgraded from 7Plus to the Xr two weeks ago. Immediately, the new phone had a problem with the volume of the caller. You could be in a conversation and, suddenly, the caller volume dropped about two-thirds. Barely audible. You had to have around for the volume to come back to normal. Took the phone back to the Verizon store the next day. They replaced it with another new Xr. Same problem. The first phone was setup with a restore from backup. So, the second phone was setup as a new phone. We have a Genius Bar appointment this Saturday. Does anyone know of something that could cause this before I drive 50 miles to the Apple store?